Configure Cluster and Sentinel Redis setups via address string

[FZambia]

This PR makes it possible to use RedisShardConfig.Address to configure Sentinel or Cluster based setups by including more addresses and extends Redis URL parsing.

[codecov]

Codecov Report

Attention: Patch coverage is 78.67647% with 29 lines in your changes missing coverage. Please review.

Project coverage is 83.11%. Comparing base (ab848d1) to head (5162858).
Report is 1 commits behind head on v0.34.0_dev.

Files with missing lines	Patch %	Lines
broker_redis.go	60.46%	12 Missing and 5 partials ⚠️
redis_shard.go	86.51%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           v0.34.0_dev     #427      +/-   ##
===============================================
+ Coverage        82.97%   83.11%   +0.13%     
===============================================
  Files               39       39              
  Lines             8721     8781      +60     
===============================================
+ Hits              7236     7298      +62     
+ Misses            1124     1122       -2     
  Partials           361      361              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.